This reverts r63675 based on the discussion in this thread:

 http://mail.python.org/pipermail/python-dev/2008-June/079988.html

Python 2.6 should stick with PyString_* in its codebase.  The PyBytes_* names
in the spirit of 3.0 are available via a #define only.  See the email thread.
diff --git a/Modules/_sqlite/row.c b/Modules/_sqlite/row.c
index 8815116..3419267 100644
--- a/Modules/_sqlite/row.c
+++ b/Modules/_sqlite/row.c
@@ -86,13 +86,13 @@
         item = PyTuple_GetItem(self->data, _idx);
         Py_XINCREF(item);
         return item;
-    } else if (PyBytes_Check(idx)) {
-        key = PyBytes_AsString(idx);
+    } else if (PyString_Check(idx)) {
+        key = PyString_AsString(idx);
 
         nitems = PyTuple_Size(self->description);
 
         for (i = 0; i < nitems; i++) {
-            compare_key = PyBytes_AsString(PyTuple_GET_ITEM(PyTuple_GET_ITEM(self->description, i), 0));
+            compare_key = PyString_AsString(PyTuple_GET_ITEM(PyTuple_GET_ITEM(self->description, i), 0));
             if (!compare_key) {
                 return NULL;
             }